{"product_id":"antique-c-1924-de-forest-audion-vacuum-tube-likely-dv-5-isolantite-4-pin-radio-amplifier","title":"Antique c.1924 De Forest Audion Vacuum Tube Collectible | Likely DV-5 | Isolantite 4-Pin Radio Amplifier","description":"\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eA remarkable survivor from the earliest years of radio technology.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eThis antique De Forest Audion vacuum tube dates to approximately the mid-1920s and appears most consistent with the De Forest DV-5 5-volt amplifier Audion, based on its four-pin Isolantite base, overall dimensions, internal electrode construction, patent markings and bottom number 9146.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eThe tube features a clear tipped glass envelope with its original internal plate, grid and filament structure still visible. The ceramic base retains substantial original printing, including:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eISOLANTITE\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eDe Forest AUDION\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eTRADE MARK\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003ePatent dates extending through 5-1-23\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e“SOLD ONLY FOR AMATEUR AND EXPERIMENTAL…”\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eThe underside is stamped 9146.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eClosely related De Forest DV-2 tubes used similar envelopes and bases, so the DV-5 identification is presented as likely rather than absolute in the absence of a surviving model designation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eApproximately 4” high × 1” wide, this compact piece carries an enormous amount of early technological history. Lee de Forest’s Audion triode became an important part of the development of radio detection, amplification and early broadcasting.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eBeyond radio collecting, its wonderfully aged glass, ceramic base and exposed internal components make it a fantastic piece for a curiosity cabinet, vintage scientific collection, industrial display, laboratory vignette or mad-scientist-inspired Halloween display.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eIt looks especially striking incorporated into a collected shelf vignette among old bottles, scientific objects, inkwells and apothecary-style pieces.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eIdentification\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eMaker: De Forest Radio Telephone \u0026amp; Telegraph \/ De Forest\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eType: Audion Triode Vacuum Tube\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eProbable Model: DV-5\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eModel identification: Likely; not definitively marked\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eBase: 4-pin Isolantite ceramic base\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eBottom number: 9146\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eApproximate date: c. \u003ca href=\"tel:1924-1925\"\u003e1924–1925\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eCountry: United States\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eMeasurements \u003c\/span\u003e\u003cspan class=\"s1\"\u003eApproximately:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003e4” high × 1” wide\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eWeight shown: approximately 2.1 oz\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eCondition\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eAuthentic antique condition with considerable age-related character.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eGlass shows cloudiness, hole in top  interior silvering\/residue, spotting and surface wear consistent with its age. The Isolantite base has staining, discoloration, scratches and wear while retaining substantial original printed markings. Metal pins show age-related oxidation and patina.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eThere is also a small remnant of aged material visible inside the lower glass area.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eElectrical functionality has not been tested. This piece is being offered as an antique collectible and display object rather than as a guaranteed functioning electronic component.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003ePlease review all photographs carefully, as they are considered part of the condition description.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eDisplay \/ Styling\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eWonderful for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eEarly radio collection • vintage electronics display • scientific collectible • curiosity cabinet • industrial décor • apothecary display • laboratory vignette • oddities collection • mad scientist décor • Halloween shelf styling • collected vignette\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eEra\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003e1920s\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eStyle\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eIndustrial, Scientific, Early Technology, Antique Radio, Oddities, Curiosity Cabinet\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003cspan class=\"s1\"\u003eVin#53: Midnight Mashup Manor \/ Luna Noire Collection\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e","brand":"De Forest AUDION","offers":[{"title":"Default Title","offer_id":54569376743708,"sku":"091426003-015-1298-095","price":40.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/2236\/5468\/files\/F1303FA2-9DAC-4F7A-8CBD-F0591FE256C0.jpg?v=1789428449","url":"https:\/\/www.callmeoldfashionedvintageshop.com\/products\/antique-c-1924-de-forest-audion-vacuum-tube-likely-dv-5-isolantite-4-pin-radio-amplifier","provider":"Call Me Old Fashioned Vintage Shop","version":"1.0","type":"link"}